If you are trying to conceal your Marijuana grow from sight besides other obvious things, you could grow around them plants that grow tall enough as to conceal and camouflage your grow... like tomatoes.

MJ looks like MJ. It also smells like MJ, so for an outdoor grow you need to be far away from anybody else -- no neighbors, no kids in the park, no meter readers or utility workers or hikers or anybody. The odor of a flowering MJ plant can travel 100 yards downwind.